Factual error: Near the end of the movie a fire accidentally starts in the center of the ballroom. It activates a fire sprinkler but every other sprinkler also activates. Fire sprinklers are activated by heat so only the one(s) nearest the fire would have activated.
Factual error: In the scene where Drew begins his road trip to Elizabethtown, you see him traveling across a bridge into the city of Louisville. Elizabethtown is located south of Louisville as is the airport. Unless he was already lost, there's no way that he would have traveled that particular route. (The scene was obviously used to highlight the city in the movie).